Pressure-gage.



G. T. HAGKLEY. PRESSURE GAGE.

APPLICATION FILED 001223, 1911. 1,061,472. Patented May 13, 1913.

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GEORGE T. HACKLEY, OF LOS ANGELES, CALIFORNIA.

PRESSURE-GAGE.

Speciicaton of Letters Patent.

Application filed October 23, 1911.

Serial No. 656,337.

To all whom z't may concern Be it yknown that I, GEORGE T. HACKLEY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented a new and useful Pressure-Gage, of which the following is l a specification.

This invention relates to pressure gages especially adapted for use on pneumatic tires, and the object of the invent-ion is to provide a gage which may be attached to the valve of the pneumatic tire and remain attached thereto while the tire is in use, the gage being so constructed that it will indicate at all times the pressure of the air in the tire.

VThe important and novel feature of the I invention is that the indicating member is rotatable and arranged with its axis longitudinal to the valve. That is to say, the axis of rotation of the indicating member is radial to the Wheel on which the tire is carried when the gage is in use. The advantages attained by this are that the centrifugal force produced by the rotation of the wheel acts longitudinally of the axis of the rotating member. The end thrust to which the rotating 4 indicating member is subjected does not interfere with its accuracy as all parts are Subjected uniformly to the same action. Another advantage of this construction is that it is possible to employ an indicating meinber on which numerals representing the pressure may be printed in large type so as to be easily readable from a considerable distance. This construcon of indicating inember enables the use o a rotating indicating member with largest figures in the smallest and most' compact form, and permits the tire to be inflated through the center of the gage without requiring the removal of the gage, and avoiding the objectionable features of a laterally projecting inlet stem.

Referring to the drawings: Figure 1 is a side elevation of the invention. Fig. 2 is a longitudinal cross-section through the device, on an enlarged scale. Fig. 3 isa cross-section on line ac3-w3 Fig. 2. Fig. 4 is a section on limited-a:4 Fig. 2. Fig. 5 is a side elevation of a portion of a wheel and tire equipped with the Fig. 6 is a side age. elevationlin detail ofg the valve casing. Fig.

7 is a perspective in 'detail of the indicating member. Fig. l8 is a view similar to Fig. 3

`showing the indicating member partially turned by the extension` of the expansion member. Fig. 9 is a` view similar to Fig. 2,`

Patented May 13, 1913.

gage, which is provided wit-h interior threads 2 adapted to be screwed to the valve of the tire not shown. The barrel 1 has an enlarged head 3 with a sight opening 4 closed by a transparent panel 5, and arranged within the head 3, concentric therewith, and rotatable with its axis longitudinal to the barrel 1 is an indicating drum 6 with a hub 7 which is journaled on a conduit 8 which extends longitudinally and centrally through the head 3 and contains a valve 9 of any suitableconstruction, which will 'permit air to pass inwardly through the conduit 8 into the tire but normally prevents its outward passage therethrough.

The valve herein shown is in universal use and of well known construction, the sliding valve a being yieldingly held by a spring b against the stationary valve seat c and preventing escape of air through passage d. By depressing valve stem e to which the valve a is rigidly attached, the valve a is moved away from its seat and air can then escape through the passage d or can be pumped into the tire through the passage d,

the cap 16 having first been removed. The lower end of the conduit 8 has an extension 10 for depressing the valve stern of the tire lvalve not shown, and is provided with a central air passa e 11 which places theinterior of the con uit 8 into communication with the space within the tire. The extention 10 need not be employed when the tire valve is removed from the tire as the valve 9 is suiiicient. However in some cases" it may be desirable to apply the gage to a tire without removing the valve from the tire, in which case the extension 10 is useful. The conduit 8 has a lateral abutment 12 with a .branch air passage 13 leading from the interior of the conduit 8, and an expansible means is arranged in communication with the branch air passa e and engages an abutment 13 Fig. 3 whic projects inward from the indicating drum 6. Primarily, the conduit is necessary to conductl air into the tire and to conduct air from the tire to the branch 13, and thence to the expansible means. Secondarily, it acts as a casing for 'the valve, but the valve is not essential to In the' present form the several convolutions.

against the abutment 13.

falls l ing the invention though it is advantageous. expanslon means consists of a hollow, non-stretohable tape 14 which is air tight and is arranged with A helical spring 15 is arranged within the drum 6, one end of the spring being attached to the drum and the other end being attached to the conduit 8, as clearly shown in Fig. 4, the spring 15 exerting a constant tension on the drum 6 tending to hold the abutment 13 toward the abutment 12. The hollow tape 14 being in constant communication with the interior of the conduit 8 causesr the pressure within the tape 14 to correspond to that which is within the tire and the coils of the tape will be expanded accordingly and" in proporgzion to the resistance presented by the spr'ng 15 and the drum 6 will be rotated a corresponding distance. rI he tension of the spring 15 is such that when the maximum pressure which the gage is to register is in the tire this Apressure will be suiiicient to expand the hollow tape, which, acting will rotate the overcome the spring 15 to the point where the largest numeral on the inl dicator appears to view `through the sight opening 5. When the pressure in the tire the spring 15 will retract the indicatdrum 6 and correspondingly collapse the tape, bringing the corresponding nu- 'meral of the indicating drum into view at the sight opening 5. When the ressure in drum 6 and Ihe tire is at the minimum whic thegage will register, or at any point below that, the smallest indicating numeral of the indicating drum'wi'll stand in view.'

The conduit 8 protrudes above the head 3 40 and is covered with a dust-cap 16 which may be removed at any time to enable va hose from the airsupply to be attached to iniate the tire. As air is thus introduced and the pressure rises in the tire the indii eating drum 6 will gradually turn as the pressure increases, bringin the successive `numerals into view. at the slght opening, so

, that' when the desireddegree 'of pressure 1s reached it is shown at a glance and further lnflati'on stopped. This lenables the tire to be q uickly and accurately-inated.

Figs. 9, '10. and 11 represent a modified form in which an indicating member comprising a helical hollow spring Wire 18 is employed, the'inner end of which is in com` munication with the central conduit 17 and the outer end `of the hollowv wire is closed.

Indicatin numerals are placed on the outer surface -o the indicating member and show through the sight opening 19.

. The hollow indicating member 18 shown in detail in Fig. 11 stands normally when not under pressure `with its coils contracted.

lsocket on the valve nipple,

When the air pressureris. admitted to the curvedco11s the pressure causes them to assume larger arcsl which results in moving around the free end of the wire and bringing a corresponding numeral into view through the sight opening. In Fig. l0 the indicating member yis shown in expanded position to indicate the highest pressure. The advantage of this form is its simplicity and direct action withrfewest possible parts.`

What I' claim is 1. A barrel adapted to be screwed to the valve of a tire, an indicating drum rotatable in said barrel with its axis longitudinal 1with the barrel, ,the barrel having a sight opening and the indicating drum having numerals visible consecutively through said opening, means for conducting air through said drum, and means communicating with said air conducting means and responsive to the air pressure in the tire for rotating said indicating drum.

`2. A barrel, a conduit in the upper portion of said barrel and protruding above the barrel for the attachment of inlating means, a valve in said conduit, there being an annular space formed between said conduit and the wall ofsaid barrel, pressure operated indicating means movable circularly in said space and provided with indicating marks, said barrel having a sight opening for revealing a portion means. f

3. A pressure gage comprising a barrel, a drum revoluble therein, a conduit extending into the barrel through the drum, pres'- sure operated means within the drum communicating with the conduit for revolving the, drum when pressureis applied, the barrel having ai sight opening and the drum having indicatingnumerals which are consecutively brought into view in the sight opening when the drum is revolved.

4. A pressure gage comprising a barrel havin a socket adapted to fit over and forming a housing for the valve nipple of.

for attaching said l said barrel having a chamber above said` socket, the side the pneumatic tire, means wall of said chamber having a sight open ing, pressure operated indicating means 1n said chamber with numerals, the indicating means being circularly movable to move' said numerals consecutively into position in register with said i ht opening, a conduit extending throughqte upper wall of said chamber through saidy pressure operated indicating meansl and communicating with said socket, and `means in the upper end of` said socket for depressing the valve stem of the valve vin the tire.- 5. A pressure gage comprisinga barrel, a

drum revoluble in said barrel and having indicating numerals on its outer surface, the barrel having a slght openin to reveal the indicating numerals, a con uit extending through said' drum,and communicating with of the vindlcating a source of rassure, a hollow extensible my hand at Los Angeles, California, this Irlilemberdmova l lvlviltlhin the baliriel aroubnd 17th day of October, 1911. t e con uit, sai o ow extensi e mem er communicating with said conduit and hav- GEORGE T' HACKLEY' 5 ing a connection with the drum for turning In `presence ofthe drum. F. A. CRANDALL, In testimony whereof, I have hereuntov set GLADYS RUSSELL. 

